Abstract:
Layered double hydroxides (LDHs) known as anionic clays are an
important class of ionic lamellar solids. The anionic clays exhibit anion
sorption, anion diffusion and exchange properties together with surface
basicity making them materials of importance for many modern applications.
The LDHs clays are useful in agriculture due their physical and chemical
properties, in order to obtain organic products. This work is a study
concerning the plant growth dynamics of corn plant during the LDHs action.
To study the effect of anionic clays on plant growth, we prepared MgAlLDH
(Mg Al Layer Double Hydroxide)+ sal and Mg Al LDH + sal +Fe3O4.
Seeds of corn (Zea mays) were put into Petri dishes on double filter
paper together with suspensions from these anionic clays and they were kept
here for 3 days. The dynamics of germination and the growth has been
monitorized during the first phenophase of growth. After that the germinated
seeds were planted in soil where they continued to growth. The content of
photosynthetic pigments has been obtained spectrophotometrically. The best
anionic clay from point of view of plant growth was the clay containing Mg,
salicylic acid and magnetite. Despite the fact that the germination was faster
for the control than the other variants, the content of the photosynthetic
pigments was greater for the treated plants. A slow release of the active
substance from nanocomposite material can be exploited for control release
formulation of some pesticides or plant growth stimulators; this means the
intercalation of pesticides or plant growth stimulators into layers of LDH is a
feasible solution. Because are not toxic they can be materials of great
interest especially in organic agriculture. Therefore they can substitute some
fertilizers or plant growth stimulators (especially toxic chemical compounds)
in order to obtain organic products.
